Ward_Lect31A_Arthropoda 1_ppt

Ward_Lect31A_Arthropoda 1_ppt - BIS2C Winter 2010 (Ward)...

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Unformatted text preview: BIS2C Winter 2010 (Ward) Lecture 31. Arthropoda, Part 1 Todays first lecture (5 March) introduction to Arthropoda major features within-group diversity (part) 2 nd Friday lecture Arthropoda, Part 2 Major lineages of metazoans Protostomes Arthropoda molting of exoskeleton, regulated by ecdysone Numbers of described species among the major animal groups (from Wilson, 1992). Sponges and diploblasts Numbers of described species among the major animal groups (from Wilson, 1992). Mollusca Numbers of described species among the major animal groups (from Wilson, 1992). Annelida Numbers of described species among the major animal groups (from Wilson, 1992). Arthropoda Arthropoda a hyperdiverse group extraordinary diversity, comprising about 3/4 of all described animal species many other species undescribed or undiscovered, perhaps 50+ million species altogether found in all habitats (marine, freshwater, terrestrial) Arthropoda Bilaterally symmetrical coelomate protostomes with segmented body , with structures repeated in each segment Arthropoda Bilaterally symmetrical coelomate protostomes with segmented body, with structures repeated in each segment paired jointed appendages with internal muscle attachments Arthropoda Bilaterally symmetrical coelomate protostomes with segmented body, with structures repeated in each segment paired jointed appendages with internal muscle attachments The name Arthropoda = jointed foot Arthropoda Bilaterally symmetrical coelomate protostomes with segmented body, with structures repeated in each segment paired jointed appendages strong tendency towards tagmosis : regional specialization of body ( tagmata , e.g., head, thorax, abdomen) tagma : singular tagmata : plural Degree of tagmosis (division into functional subunits ) varies among different kinds of arthropods Centipede Lobster Arthropoda Bilaterally symmetrical coelomate protostomes with segmented body, with structures repeated in each segment paired jointed appendages tagmosis: division of body into functional subunits exoskeleton (composed of chitin and cuticle proteins) organized into articulating plates Courtesy of: http://evolution.berkeley.edu/evolibrary/home.php Consequences of an exoskeleton support for walking on land protection against predators chitin reduces water loss But it also introduces constraints on growth Arthropoda Bilaterally symmetrical coelomate protostomes with segmented body, with structures repeated in each segment...
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Ward_Lect31A_Arthropoda 1_ppt - BIS2C Winter 2010 (Ward)...

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